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Jill Feffer, MD

Jill Feffer, MD

Clinical Instructor of Medicine at New York University School of Medicine

Endocrinology, Diabetes & Metabolism

Dr. Jill Feffer is a board-certified endocrinologist and a board-certified internist. Her areas of expertise include:

  • Adrenal and pituitary disorders
  • Osteoporosis and interpretation of bone densitometry, metabolic bone diseases and calcium disorders including hyperparathyroidism
  • Benign and malignant thyroid diseases
  • Diabetes mellitus including continuous glucose monitoring and insulin pump management
  • Polycystic ovarian syndrome (PCOS) and menstrual disorders
  • Transgender medicine
  • Obesity management

Dr. Feffer earned an A.B. in molecular biology from Princeton University, then attended New York University School of Medicine. She completed internship and residency in Internal Medicine at the Zucker School of Medicine at Hofstra/Northwell and fellowship in Endocrinology, Diabetes and Metabolism at the Icahn School of Medicine at Mount Sinai Beth Israel, Mount Sinai St. Luke’s and Mount Sinai West. Dr. Feffer has presented and published thought-provoking case reports at professional society meetings and in peer-reviewed journals, and she was selected to attend the Harvard Macy Institute’s Program for Post-Graduate Trainees: Future Academic Clinician-Educators in 2017.

Dr. Feffer is a member of the American Association of Clinical Endocrinologists, the Endocrine Society and the American College of Physicians. She is conversant in medical Spanish and derives immense satisfaction from partnering with her patients to develop individualized treatment plans.



Undergraduate & Graduate

Princeton University: A.B. in Molecular Biology

Medical Education

New York University School of Medicine


Zucker School of Medicine at Hofstra/Northwell: Internal Medicine


Icahn School of Medicine at Mount Sinai Beth Israel, Mount Sinai St. Luke’s and Mount Sinai West: Endocrinology, Diabetes and Metabolism

Board Certifications

Internal Medicine